3GHz, can i use dual kit 2x2 or do i need to get q. I am looking at two ultra books, one has Octa core 1.7GH, the other has Quad core 2.1 GHz. Which is better: an Octa core 1.7 GHz processor o.Some models of dual-core Intel processors perform better than some models of AMD quad- core processors. I find that if I want a Quad core with i7 Intel processor the clock speed of the processor is 1.7 GHz (for the notebook).But if I opt for i5 (dual core, as I understand it) the clock speed will be 2.53 GHz.Between Higher clocking speeds and just duo VS. Lower clocking speed but quad cores which one What about Ryzen 7 mobile vs 8th gen Core i7? Conclusion.